Added console group APIs to NullConsole

[eranimo]

Fixes #9018

Summary

This PR fixes the --silent CLI option, which previously didn't silence console group calls.

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[SimenB]

Thanks!

Could you add an entry to the changelog?

[jeysal]

ping @eranimo :)
(let me know if I should add the changelog entry for you)

[codecov-io]

Codecov Report

Merging #9024 into master will not change coverage.
The diff coverage is n/a.

@@           Coverage Diff           @@
##           master    #9024   +/-   ##
=======================================
  Coverage   64.69%   64.69%           
=======================================
  Files         277      277           
  Lines       11701    11701           
  Branches     2873     2873           
=======================================
  Hits         7570     7570           
  Misses       3514     3514           
  Partials      617      617

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